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Proceedings Paper

Acoustic Tomography For Imaging The Nonlinear Parameter
Author(s): Nicholas Arnold; Anni Cai; Yoshikatsu Nakagawa; Wayne Hou; Glen Wade; Masahide Yoneyama; Masao Nakagawa
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Paper Abstract

When acoustic waves propagate through a nonlinear reactive medium, they can generate a variety of secondary waves. This generation depends on the magnitude of the nonlinear parameter β of the medium. Large variations of β in biological tissue (from 3.5 to 6.5) are reported in the literature. Tomographic imaging of the nonlinear parameter β in human organs is currently being proposed as a potentially powerful tool in medical diagnosis. The magnitude of the generated secondary waves can be described by a line integral of the distribution of along the propaga-tion path. We analyze two types of tomographic image reconstruction of the nonlinear parameter. In one case, two primary waves of different frequencies are used to parametrically excite a difference-frequency secondary wave, which is then detected. In the other case, a single-frequency primary wave produces a second-harmonic wave, which is then detected. In this paper, we present the underlying mathematics and physical assumptions which describe the generation of the secondary waves in the above two cases. The approximations and simplifications used in image reconstruction are justified. The experimental results we have thus far obtained are stated, and possible modifications in the reconstruction algorithm and imaging system are considered.

Paper Details

Date Published: 10 September 1987
PDF: 7 pages
Proc. SPIE 0768, Pattern Recognition and Acoustical Imaging, (10 September 1987); doi: 10.1117/12.940253
Show Author Affiliations
Nicholas Arnold, University of California (United States)
Anni Cai, University of California (United States)
Yoshikatsu Nakagawa, University of California (United States)
Wayne Hou, University of California (United States)
Glen Wade, University of California (United States)
Masahide Yoneyama, Ricoh Co. Ltd. (Japan)
Masao Nakagawa, Keio University (Japan)

Published in SPIE Proceedings Vol. 0768:
Pattern Recognition and Acoustical Imaging
Leonard A. Ferrari, Editor(s)

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